package/grpc: new package

Signed-off-by: Robert Rose <robertroyrose@gmail.com>
[Thomas:
 - add missing Config.in dependencies inherited from
   BR2_PACKAGE_PROTOBUF, as well as the corresponding Config.in
   comment
 - replace spaces by tabs in grpc.mk indentation
 - remove superfluous GRPC_SOURCE variable
 - improved patch description.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
6 files changed